PORTLAND, Maine — Portland police are looking for the person who tossed a homemade chemical bomb into the Occupy Maine encampment over the weekend.

Police Chief Michael Sauschuck said three to four people were up and about at the time, but none of them were hurt early Sunday. He said detectives don’t necessarily believe Occupy Maine was the sole target because another device was set off elsewhere that night.

Sauschuck described the device Monday as the type often associated with teenage pranks. But he said police are taking it seriously because someone could have been hurt.

Occupy Maine has more than 30 tents set up in Lincoln Park, outside the Cumberland County courthouse. The group is aligned with the Occupy Wall Street movement.